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Overview
| Comment: | Use __sync_synchronous(), when available, instead of a mutex when a memory barrier is needed. |
|---|---|
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| Timelines: | family | ancestors | descendants | both | debug |
| Files: | files | file ages | folders |
| SHA1: |
7d4562e9d577e21406e05300b9a1ad56 |
| User & Date: | drh 2016-07-29 14:23:23.484 |
Context
|
2016-07-29
| ||
| 14:31 | Enhance a debugging log message to better identify a mutex. (check-in: e60cb6d885 user: dan tags: debug) | |
| 14:23 | Use __sync_synchronous(), when available, instead of a mutex when a memory barrier is needed. (check-in: 7d4562e9d5 user: drh tags: debug) | |
| 14:10 | Add calls to sqlite3_log() when sqlite3_mutex_enter() takes more than 100,000 CPU cycles. (check-in: 33c7ef7aca user: drh tags: debug) | |
Changes
Changes to src/os_unix.c.
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** All loads and stores begun before the barrier must complete before
** any load or store begun after the barrier.
*/
static void unixShmBarrier(
sqlite3_file *fd /* Database file holding the shared memory */
){
UNUSED_PARAMETER(fd);
unixEnterMutex();
unixLeaveMutex();
}
/*
** Close a connection to shared-memory. Delete the underlying
** storage if deleteFlag is true.
**
** If there is no shared memory associated with the connection then this
| > > > > | 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 |
** All loads and stores begun before the barrier must complete before
** any load or store begun after the barrier.
*/
static void unixShmBarrier(
sqlite3_file *fd /* Database file holding the shared memory */
){
UNUSED_PARAMETER(fd);
#if defined(__GNUC__) && GCC_VERSION>=4001000
__sync_synchronize();
#else
unixEnterMutex();
unixLeaveMutex();
#endif
}
/*
** Close a connection to shared-memory. Delete the underlying
** storage if deleteFlag is true.
**
** If there is no shared memory associated with the connection then this
|
| ︙ | ︙ |